The symptoms of instrumentation: when you turn the ignition off and the arrow pointer pressure gauge, thermometer and measuring the level of fuel remain fixed; abrupt fluctuations in direction or inaccurate readings. Usually the cause of failure of control equipment is off the chain button-fuse in the circuit devices. To check the circuit you must click on the safety button. If breakage of the wire connecting the sensor and the pointer at the time of ignition in the engine coolant temperature gauge and oil pressure needle deflected to the left of the failure of the left division, and the fuel level meter - to the right of the division of the "100%" scale. Swings arrows or inaccurate readings are most often the result of loose wires mounting lugs on the terminals of the sensors and indicators. Correctness statements pointers can be checked by comparing their testimony with the testimony of the arrow pointer checked: - in the electric bulb - the testimony of a mercury thermometer dipped in the coolant - have an electric manometer - a pressure gauge indication of the control that is included in an oil pipeline of the engine - - with electric meter fuel level - a comparison with the amount of fuel when filling the tank with measuring utensils. Failure in the equipment necessary to check mounting lugs conductors and the fuse wire and, if they are OK, replace the first sensor, so as sensors denied work more often than pointers. For each maintenance action test instrumentation with the engine running and remove the detected failures.
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